package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //插入一条菜品数据
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors !=null&&flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //插入n条口味数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {

        //判断菜品能否删除——————菜品是否处于起售状态

        for (Long id : ids) {
           Dish dish = dishMapper.getById(id);
           if(dish.getStatus()== StatusConstant.ENABLE){
               //表示菜品处于起售状态不能删除
               throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
           }
        }
        //判断菜品能否删除——————菜品是否关联了其他套餐

        List<Long> setmealIds = setmealDishMapper.getSetmealIdByDishId(ids);
        if(setmealIds != null && setmealIds.size()>0){
            //说明菜品关联了套餐不能被删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }*/

        //根据菜品id集合批量删除菜品数据
         dishMapper.deleteByIds(ids);
        //根据菜品id集合批量删除口味数据
         dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和口味信息
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {

        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据id查询口味数据
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);
        //将查到的数据封装在vo中

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavors);

        return dishVO;
    }
    /**
     * 根据id修改菜品信息以及对应的口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //修改菜品表基本信息
        dishMapper.update(dish);
        //删除口味表信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //插入新的口味信息
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors !=null&&flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //插入n条口味数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品的起售，停售
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder().id(id).status(status).build();
        dishMapper.update(dish);
        if(status==StatusConstant.DISABLE){
            //如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds =new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in(?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdByDishId(dishIds);
            if(setmealIds!=null&&setmealIds.size()>0){
                for(Long setmealId:setmealIds){
                    Setmeal setmeal =Setmeal.builder().id(setmealId).status(StatusConstant.DISABLE).build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
}
